This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A026823 #1 Dec 11 1999 03:00:00 %S A026823 0,1,0,0,1,1,1,1,2,2,3,3,4,5,6,7,9,10,12,15,17,20,24,28,32,38 %N A026823 Essentially same as A025148. %K A026823 dead %O A026823 1,9